Cronbach alpha coefficient 1 Evaluation 1 Nurse educators 1 Nursing students 1 Oral presentation 1 Scale development 1 article 1 confirmatory factor analysis 1 human 1 human experiment 1 internal consistency 1 interview 1 learning 1 major clinical study nurse 1 nursing student 1 self evaluation 1 self report 1 skill 1 speech 1 validation process 1